Good tips but 100% sure it was the correct server since all my structures were there. And the “Beacon Effect” box was the first thing I checked, and it was activated.
On that day I logged on, noticed something was odd, then realized the beacon was missing entirely. No beacon name, no green box when mousing over blocks in the beacon area, no beacon effect, nothing at all. At that point I checked my settings and confirmed that Beacon Effect was enabled. But nothing else was wrong, the client was running normally and all other functionality/gameplay was working as intended. I then logged off for few minutes. When I logged back on, everything was good again so it remains a mystery. First and only time I had it happen as well.